Hey North Texas -- Chiming in here to echo Josué as well as point you to one other place in your account with detailed information on bounces. You can always view your error contacts in the audience, but if you're looking for more details on why those contacts bounced, you can hop over to one of your recent mailings to view the bounce report.

Here you can see which bounces were hard or soft. You can trust that any hard bounce went straight to error, while the soft bounces may have a few more send attempts left in them. You can also view an individual contact history to see which mailings you've sent to them and which one(s) they may have bounced on.